Extruding metal.



PATENTED JULY 3, 1906.

G. W. LEE. EXTRUDING METAL. APPLICATION FILED 001 14 1903 UNITED STATESPATENT OFFICE.

GEORGE W. LEE, OF BINGHAMTON, NEW YORK, ASSIGNOR TO FRED L. LEE, JAMESG. OLONNEY, AND LESLIE E. HOOKER, OF BINGHAMTON, NEW YORK, AND A. M.OLONNEY, OFNEW YORK, N. Y.

YEXTRUDING METAL.

Patented July 3,1906.

1'0 (ZZZ whom, it may concern:

Be it known that I, GEORGE, W. LEE, a citizen of the United States, anda resident of Binghamton, in the county of Broome and State of New York,have invented a new and useful Improvement in Extruding Metal, of whichthe following is a specification.

My invention relates to a method for making tubular metallic bodies ofany suitable metallike aluminium, for instancebyconfining a blank ofcold metal against lateral extension and subjecting said blank tointense pressure under the immediate impact of a fluid, by means ofwhich fluid all of the metal contained in the blank may be extruded from7 the die, leaving the die free for the reception of the next blank. Bythis means tubular bodies may be made in very short strokepresses,whereas if the fluid were not used for freeing the die a muchlonger stroke press, necessitating a knock-out movement, would berequired, and a flange would have to be trimmed away by a subsequentoperation. The fluid also acts as a cushion upon the descending tool,thereby greatly prolonging the life of said tool and also greatlyreducing the friction by keeping the metal in the blank from directcontact with the tool, thereby making it possible to form such tubularbodies with less power than when the fluid is not used. Such tubularbodies may also by this process be made with simpler and less expensivedies, no knock-out being required. In

making small tubular bodies by the flowing of cold metal the use of theknock-out is a serious objection, because of the intense strain and theliability of the metal to flash as soon as the joint in the die becomesat all worn.

Means for carrying the method into practical use are illustrated in theaccompanying drawings, in which.

Figure 1 is a view in elevation, partly in section, showing a die, ahammer or plunger, and a disk of metal in position to be operated upon,the hammer or plunger being in its elevated position. Fig. 2 is asimilar view showing the position of the hammer or plunger in contactwith the disk and showing also the result of the stroke upon the disk.Fig. 3 is an enlarged plan view of the disk of metal before it isoperated upon. Fig. 4 is an edge view of the same, and Fig. 5 is a Viewof the same after it has been operatedupon by the hammer.

The die is denoted by A. In the present instance it is provided with anenlarged bore a at the top, and from this there extends centrally asmaller bore a, which is to determine the sizeof the pin or tube whichit is intended the disk shall form under the pressure exerted upon it.The die A is firmly seated in a suitable bed-piece B, from which thereuprise guide-arms b1) for controlling the reciprocating movement of thehammer or plunger C.

The hammer or plunger O is conveniently provided on its face with aremovable head I),

adapted to fit with a close sliding fit the bore a in the die and in thepresent instance, where it is to be converted into a tubular pin, havinga thin head or flange. The headpiece D is rovided with a central teat d.

The dis of metal which is to be operated uponsuch, for instance, asaluminium, copper, zinc, or other metal that can be successfullyutilizedis denoted by E and is in the present instance provided with acentral perforation e. The central perforation c is not,

however, essential, but is used where the pin to be formed bymanipulating the disk is intended to be an open tube. The disk E isintended to fit the bore a in the die and is held by the die againstlateral extension. The

depth of the bore a is greater than the thickness of the disk E ofmetal, so that the head of the hammer or plunger will enter the bore ain the die before it comes into close proximity to the disk. At or aboutthe same time that the head D of the hammer or plunger enters the bore ain the die the end of the teat d is intended to enter the erforation ein the center of the disk E, t ereby closing the space between the uppersurface of the disk E and the end surface of the head D of the ham meror plunger air-tight. The further downward movement of the hammer orplunger will serve to compress the air above the disk E, and thepressure exerted upon thedisk through the medium of the stratum ofcompressed air will cause the latter'to flow along the wall of thesmaller bore a of the die between the exterior. of the teat d and theinterior of said bore.

In practice'I prefer to use the compressed air as the intervening mediumbetween the end of the head D and the disk, and in order that the airmay not escape I form the fit between the head D and the bore a asperfect as may be and suitably lubricate the inner wall of ,the bore ato make the joint air-tight and at the same time permit the head D ofthe hammer-to slide into proximity to the disk With as little frictionas may be. I may use instead of compressed air a thin layer of oilorcarbonic-acid gas, and it may be that ex periment will rove that it ispracticable to use other flui s than those mentioned. By means of thisintervenin layer of com ressed fluid the molecules of t e metal in t edisk under treatment are ermitted to flow without great frictionalobstruction, as Would be the case if the surface of the head D were inactual contact with the disk. Hence I am enabled to force the metal indirections and to an extent hitherto supposed impossible.

' By reducing the size and sha e of the teat I (Z and changing the sizeof the ore a I may ing part of the subject-matter of my presentapplication.

What I claim is The method of extruding metal from a die, consisting inconfining a suitable cold metal blank in the bottom of a perforated dieagainst lateral extension, interposin fluid between such confined metaland a p unger tightly fitting the cavity of the die, and impartingmovement to the plunger to force the metal through the die,substantially in the manner and for the purpose described.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two witnesses ,this 7th day of October,

GEORGE W. LEE. Witnesses:

FREDK. HAYNES, G. S. SUNDGREN.

